[Milsurplus] Motor tuned ARR-2 ?

[Hubert Miller]

On Ebay now, this motor tuned ARR-2 receiver. I have not seen one before. So how was this controlled; is it continuous
or step tuned?
-Hue Miller

https://www.ebay.com/itm/265677200648?mkevt=1&mkpid=0&emsid=e11021.m43.l1120&mkcid=7&ch=osgood&euid=efdb853c4ce44eeca2af149b9c758b10&bu=43186714112&ut=RU&osub=-1~1&crd=20220505013601&segname=11021&sojTags=ch%3Dch%2Cbu%3Dbu%2Cut%3Dut%2Cosub%3Dosub%2Ccrd%3Dcrd%2Csegname%3Dsegname%2Cchnl%3Dmkcid

WWII Military Radio R-4A/ARR-2 Homing/Navigation Receiver
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